xref: /openbmc/linux/drivers/acpi/acpi_apd.c (revision 5a170e9e) 
1 /*
2  * AMD ACPI support for ACPI2platform device.
3  *
4  * Copyright (c) 2014,2015 AMD Corporation.
5  * Authors: Ken Xue <Ken.Xue@amd.com>
6  *	Wu, Jeff <Jeff.Wu@amd.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 
13 #include <linux/clk-provider.h>
14 #include <linux/platform_data/clk-st.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_domain.h>
17 #include <linux/clkdev.h>
18 #include <linux/acpi.h>
19 #include <linux/err.h>
20 #include <linux/pm.h>
21 
22 #include "internal.h"
23 
24 ACPI_MODULE_NAME("acpi_apd");
25 struct apd_private_data;
26 
27 /**
28  * ACPI_APD_SYSFS : add device attributes in sysfs
29  * ACPI_APD_PM : attach power domain to device
30  */
31 #define ACPI_APD_SYSFS	BIT(0)
32 #define ACPI_APD_PM	BIT(1)
33 
34 /**
35  * struct apd_device_desc - a descriptor for apd device
36  * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
37  * @fixed_clk_rate: fixed rate input clock source for acpi device;
38  *			0 means no fixed rate input clock source
39  * @setup: a hook routine to set device resource during create platform device
40  *
41  * Device description defined as acpi_device_id.driver_data
42  */
43 struct apd_device_desc {
44 	unsigned int flags;
45 	unsigned int fixed_clk_rate;
46 	struct property_entry *properties;
47 	int (*setup)(struct apd_private_data *pdata);
48 };
49 
50 struct apd_private_data {
51 	struct clk *clk;
52 	struct acpi_device *adev;
53 	const struct apd_device_desc *dev_desc;
54 };
55 
56 #if defined(CONFIG_X86_AMD_PLATFORM_DEVICE) || defined(CONFIG_ARM64)
57 #define APD_ADDR(desc)	((unsigned long)&desc)
58 
59 static int acpi_apd_setup(struct apd_private_data *pdata)
60 {
61 	const struct apd_device_desc *dev_desc = pdata->dev_desc;
62 	struct clk *clk = ERR_PTR(-ENODEV);
63 
64 	if (dev_desc->fixed_clk_rate) {
65 		clk = clk_register_fixed_rate(&pdata->adev->dev,
66 					dev_name(&pdata->adev->dev),
67 					NULL, 0, dev_desc->fixed_clk_rate);
68 		clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
69 		pdata->clk = clk;
70 	}
71 
72 	return 0;
73 }
74 
75 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
76 
77 static int misc_check_res(struct acpi_resource *ares, void *data)
78 {
79 	struct resource res;
80 
81 	return !acpi_dev_resource_memory(ares, &res);
82 }
83 
84 static int st_misc_setup(struct apd_private_data *pdata)
85 {
86 	struct acpi_device *adev = pdata->adev;
87 	struct platform_device *clkdev;
88 	struct st_clk_data *clk_data;
89 	struct resource_entry *rentry;
90 	struct list_head resource_list;
91 	int ret;
92 
93 	clk_data = devm_kzalloc(&adev->dev, sizeof(*clk_data), GFP_KERNEL);
94 	if (!clk_data)
95 		return -ENOMEM;
96 
97 	INIT_LIST_HEAD(&resource_list);
98 	ret = acpi_dev_get_resources(adev, &resource_list, misc_check_res,
99 				     NULL);
100 	if (ret < 0)
101 		return -ENOENT;
102 
103 	list_for_each_entry(rentry, &resource_list, node) {
104 		clk_data->base = devm_ioremap(&adev->dev, rentry->res->start,
105 					      resource_size(rentry->res));
106 		break;
107 	}
108 
109 	acpi_dev_free_resource_list(&resource_list);
110 
111 	clkdev = platform_device_register_data(&adev->dev, "clk-st",
112 					       PLATFORM_DEVID_NONE, clk_data,
113 					       sizeof(*clk_data));
114 	return PTR_ERR_OR_ZERO(clkdev);
115 }
116 
117 static const struct apd_device_desc cz_i2c_desc = {
118 	.setup = acpi_apd_setup,
119 	.fixed_clk_rate = 133000000,
120 };
121 
122 static const struct apd_device_desc wt_i2c_desc = {
123 	.setup = acpi_apd_setup,
124 	.fixed_clk_rate = 150000000,
125 };
126 
127 static struct property_entry uart_properties[] = {
128 	PROPERTY_ENTRY_U32("reg-io-width", 4),
129 	PROPERTY_ENTRY_U32("reg-shift", 2),
130 	PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
131 	{ },
132 };
133 
134 static const struct apd_device_desc cz_uart_desc = {
135 	.setup = acpi_apd_setup,
136 	.fixed_clk_rate = 48000000,
137 	.properties = uart_properties,
138 };
139 
140 static const struct apd_device_desc st_misc_desc = {
141 	.setup = st_misc_setup,
142 };
143 #endif
144 
145 #ifdef CONFIG_ARM64
146 static const struct apd_device_desc xgene_i2c_desc = {
147 	.setup = acpi_apd_setup,
148 	.fixed_clk_rate = 100000000,
149 };
150 
151 static const struct apd_device_desc vulcan_spi_desc = {
152 	.setup = acpi_apd_setup,
153 	.fixed_clk_rate = 133000000,
154 };
155 
156 static const struct apd_device_desc hip07_i2c_desc = {
157 	.setup = acpi_apd_setup,
158 	.fixed_clk_rate = 200000000,
159 };
160 
161 static const struct apd_device_desc hip08_i2c_desc = {
162 	.setup = acpi_apd_setup,
163 	.fixed_clk_rate = 250000000,
164 };
165 static const struct apd_device_desc thunderx2_i2c_desc = {
166 	.setup = acpi_apd_setup,
167 	.fixed_clk_rate = 125000000,
168 };
169 
170 static const struct apd_device_desc hip08_spi_desc = {
171 	.setup = acpi_apd_setup,
172 	.fixed_clk_rate = 250000000,
173 };
174 #endif
175 
176 #else
177 
178 #define APD_ADDR(desc) (0UL)
179 
180 #endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
181 
182 /**
183 * Create platform device during acpi scan attach handle.
184 * Return value > 0 on success of creating device.
185 */
186 static int acpi_apd_create_device(struct acpi_device *adev,
187 				   const struct acpi_device_id *id)
188 {
189 	const struct apd_device_desc *dev_desc = (void *)id->driver_data;
190 	struct apd_private_data *pdata;
191 	struct platform_device *pdev;
192 	int ret;
193 
194 	if (!dev_desc) {
195 		pdev = acpi_create_platform_device(adev, NULL);
196 		return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
197 	}
198 
199 	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
200 	if (!pdata)
201 		return -ENOMEM;
202 
203 	pdata->adev = adev;
204 	pdata->dev_desc = dev_desc;
205 
206 	if (dev_desc->setup) {
207 		ret = dev_desc->setup(pdata);
208 		if (ret)
209 			goto err_out;
210 	}
211 
212 	adev->driver_data = pdata;
213 	pdev = acpi_create_platform_device(adev, dev_desc->properties);
214 	if (!IS_ERR_OR_NULL(pdev))
215 		return 1;
216 
217 	ret = PTR_ERR(pdev);
218 	adev->driver_data = NULL;
219 
220  err_out:
221 	kfree(pdata);
222 	return ret;
223 }
224 
225 static const struct acpi_device_id acpi_apd_device_ids[] = {
226 	/* Generic apd devices */
227 #ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
228 	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
229 	{ "AMDI0010", APD_ADDR(wt_i2c_desc) },
230 	{ "AMD0020", APD_ADDR(cz_uart_desc) },
231 	{ "AMDI0020", APD_ADDR(cz_uart_desc) },
232 	{ "AMD0030", },
233 	{ "AMD0040", APD_ADDR(st_misc_desc)},
234 #endif
235 #ifdef CONFIG_ARM64
236 	{ "APMC0D0F", APD_ADDR(xgene_i2c_desc) },
237 	{ "BRCM900D", APD_ADDR(vulcan_spi_desc) },
238 	{ "CAV900D",  APD_ADDR(vulcan_spi_desc) },
239 	{ "CAV9007",  APD_ADDR(thunderx2_i2c_desc) },
240 	{ "HISI02A1", APD_ADDR(hip07_i2c_desc) },
241 	{ "HISI02A2", APD_ADDR(hip08_i2c_desc) },
242 	{ "HISI0173", APD_ADDR(hip08_spi_desc) },
243 #endif
244 	{ }
245 };
246 
247 static struct acpi_scan_handler apd_handler = {
248 	.ids = acpi_apd_device_ids,
249 	.attach = acpi_apd_create_device,
250 };
251 
252 void __init acpi_apd_init(void)
253 {
254 	acpi_scan_add_handler(&apd_handler);
255 }
256